----- Original Message -----
From: "Miroslav Lachman" <[email protected]>
To: "Steven Hartland" <[email protected]>
Cc: "Karl Pielorz" <[email protected]>; <[email protected]>
Sent: Tuesday, January 07, 2014 12:10 PM
Subject: Re: Is TRIM working with gmirror?
Steven Hartland wrote:
[...]
Unless you have a specific reason for using gmirror I would strongly
advise trying ZFS instead, it will definitely support TRIM in that
config and comes with a host of other benefits too :)
The specific reason is performance and memory consumption. We need every
piece of performance and all memory to MySQL daemon, so this is why
gmirror was choosen.
We have ZFS on other purposes machines for years (from 7.x days), so I
can say "I have a lot of experiences" (good and bad too).
In some tests, ZFS is about 50% slower than UFS.
What about graid(8) mirror instead of gmirror(8)? Is there better
support for TRIM on UFS?
Actually looking at it gmirror should support delete no problem see
g_mirror_init_disk GEOM::candelete.
So you might want to add some debugging around there to see whats
happening.
Regards
Steve
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